First of all, it depends on your physical fitness. If you don't have regular activities before, you can exercise for a shorter time. If you want to choose a slower pace, you can start by walking for 20 minutes every day and walk for 25 minutes the next week. Increase to 30 minutes in the third week; Add some jogging in the fourth week; Pay equal attention to walking and jogging in the fifth week; Finally run slowly.

When you are used to or like sports, it is best to stick to it for at least one to one and a half hours every day, because the human body secretes testosterone to support sports during exercise, but its secretion can only last for about one hour.

Moreover, if the exercise time is too long, the muscles will be tired, and at that time, the control will be reduced, and it is impossible to ensure safe exercise. Fitness first!